1. DomName('CanvasRenderingContext2D.rect')
  2. DocsEditable()
void rect(num x, num y, num width, num height)

Source 

@DomName('CanvasRenderingContext2D.rect')
@DocsEditable()
void rect(num x, num y, num width, num height) => _blink.BlinkCanvasRenderingContext2D.instance.rect_Callback_4_(this, x, y, width, height);